Jig for drilling, reaming, and broaching.



,965. I V PATBNTED MAY 22, 1906.

W. H. FROGGATT, Jn.

JIG FOR DRILLING, REAMING, AND BROAGHING.

APPLICATION rum! mm. 4. 1905.

2 SHEETS-SHEET 1.

m J L I A TUE/{T017 ITTORNEY.

I! TUESSES No; 820,966. 7 PATENTED MAY 22 1905.

w. H. PROGGATT, Ja.

JIG FOR DRILLING, RBAMING, AND BROACHING.

APPLICATION YILED DBCJ, 1905.

2 SHEETS-SHEET 2.

In R 1 JTTORKQ'.

UNITED STATES PATENT OFFICE.

JIG FOR DRILLING, REAMING, AND BROACHING.

Specification of Letters Patent.

' Patented may 22, 1906.

Application filed December 4,1905. Serial No. 290,312.

To all whom it may concern.-

Be it known that I, WlLLIAM H. FROGGATT,

Jr., a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Jigs for Drilling, Beaming. and Broaching Single and Multiple Dies, Punch-Holders, &c., of which the followin is a specification.

My invention re ates to jigs in which. a revolving disk, suitably graduated and bored. enables one to accurately drill, ream, and broach perfect holes in die and punch-holder blanks, &c., at any intervals.

The objects of my invention are, first, to make absolutely interchangeable dies, punchholders, &c.; second, to make the holes in said dies, punch-holders, &c., accurately at the center thereof or accurately at any given distance or distances from the center thereof or from each other; third, to make more than one single-hole die at a time; fourth, to enable an unlimited number of )unches to be used at a time in connection wit one punch-holder or more and one multiple die or more by reason of the accurate placing of holes in the said punch-holders and dies; fifth, to reduce the cost of making such punch-holders and dies; sixth, to reduce the time required to make such punch-holders and dies, and, seventh, to enable users of such punches, holders, and dies, such as medicinal-tablet manufacturers, to turn out greater quantities of such things as they manufacture more quickly and more cheaply than they can do at the present time. I attain these objects by the machine illustrated in the two accompanying drawings, in Which- Figure 1 is a top view of the entire machine; Fig. 2, a vertical section of the entire machine on the line 2 2, Fig. 1, as it appears on a drillpress ready for operation; Fig. 3, a top view of a art of the machine, being the clamp which holds the die-blank; Fig. 4, a vertical section of a part of the machine on the line 4 4, Fig. 3; Fig. 5, a top view of a part of the machine after the jig proper is removed, being the ball-retainer and balls on which the jig proper moves freely; and Fig. 6, a vertical section of a part of the machine on th: line 6 6, Fig. 5.

Similarletters refer to similar parts throughout the several views.

The disk A revolves on a tapered bearingsurfacoB on the jig proper, G, so that at iven intervals on the outside rim 0 of the disk A a latch D engages in slots C, C, C, C, and C. A tapered hole at E is bored in the disk A to hold a bushing R, in which the drill, reamer, or broacher I operates. hen the disk A is clamped to the jig proper, G, at P, and P on rim 0, holes may be drilled, reamed, or broached into a die-blank or what-not F. These holes will then be correspondingly situated with reference to the slots C, C, C, C, and C unless the hole E is directly over the center of the die-blank, &c., F. Errors will be reduced between the slots in O and between the holes in F, as the radii of their respective circles. The disk A fits down like a cap over the tapered bearing-surface B on the jig proper, G, to compensate for wear.

Under the disk A and fastened to the jig proper, G, at X, N, and N is a clamp H, which holds the die-blank, &c., F. The jig proper, G, and the disk A, which is clamped at P and P on rim 0, and the clamp H, which is screwed at N, N, and N when one hole or' more is to be drilled, reamed, or broached into the die-blank, &c., F, rest and move together freely in any direction on balls J, J, J, J, J, J, J, and J in holes L, L, L, L, L, L, L, and L in a ball-retainer K to allow the ji to adjust itself to the drill, reamer, or broac ier I contained in bushin R in hole E in disk A.

The ball-retainer K is bolted at M and M to a drill-press table S and is separate from thejig proper, G, and the parts of the machine A and II, clam ed and screwed, respectively, to G.

I pre er that this jig should weigh about fifty pounds for ordinary work, so that it may be readily held by hand or by a stop in the ball-retainer K. I also prefer that there should be a cross-bar Q on disk A in which to bore the drill-hole in preference to making disk A solid, thus saving weight.

I claim A jig comprisin an annular tapered hearing projection, a blank-holder arranged to be secured in the recess in said projection, a disk provided with index-notches and revolubly mounted on said annular projection, a support provided with a tool-aperture and extending over the blank-holder carried by said disk, a latch cooperating with the indexnotches, and means for clamping the disk.

In testimony whereof I affiu my signature in the presence of two witnesses.

WILLIAM H. FROGGATT, JR.

Witnesses:

WILLIAM H. FROGGATT, Sr. EDWARD B. ZELNER. 

